In most cases, people diagnosed with non-Hodgkin's lymphoma don't have any obvious risk factors, and many people who have risk factors for the disease never develop it. Some factors that may increase the risk of non-Hodgkin's lymphoma include:

  • Medications that suppress your immune system. If you've had an organ transplant, you're more susceptible because immunosuppressive therapy has reduced your body's ability to fight off new illnesses.
  • Infection with certain viruses and bacteria. Certain viral and bacterial infections appear to increase the risk of non-Hodgkin's lymphoma. Viruses linked to increased non-Hodgkin's lymphoma risk include HIV and Epstein-Barr virus. Bacteria linked to an increased risk of non-Hodgkin's lymphoma include the ulcer-causing Helicobacter pylori.
  • Chemicals. Certain chemicals, such as those used to kill insects and weeds, may increase your risk of developing non-Hodgkin's lymphoma. More research is needed to understand the possible link between pesticides and the development of non-Hodgkin's lymphoma.
  • Older age. Non-Hodgkin's lymphoma can occur at any age, but the risk increases with age. It's most common in people in their 60s or older.
Jul. 26, 2013

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